US20050160984A1 - Method and apparatus for ALD on a rotary susceptor - Google Patents
Method and apparatus for ALD on a rotary susceptor Download PDFInfo
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- US20050160984A1 US20050160984A1 US11/085,487 US8548705A US2005160984A1 US 20050160984 A1 US20050160984 A1 US 20050160984A1 US 8548705 A US8548705 A US 8548705A US 2005160984 A1 US2005160984 A1 US 2005160984A1
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/14—Feed and outlet means for the gases; Modifying the flow of the reactive gases
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/4412—Details relating to the exhausts, e.g. pumps, filters, scrubbers, particle traps
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
- C23C16/45548—Atomic layer deposition [ALD] characterized by the apparatus having arrangements for gas injection at different locations of the reactor for each ALD half-reaction
- C23C16/45551—Atomic layer deposition [ALD] characterized by the apparatus having arrangements for gas injection at different locations of the reactor for each ALD half-reaction for relative movement of the substrate and the gas injectors or half-reaction reactor compartments
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
- C23C16/4584—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally the substrate being rotated
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
Definitions
- Atomic Layer Deposition (also referred to as Atomic Layer Epitaxy, or ALE) is a Chemical Vapor Deposition (CVD) technique.
- Classical CVD is based on exposing a surface to a gas mixture. The surface is heated, and the heat induces a reaction and/or decomposition of the gases. This results in the formation of a solid film layer on the surface.
- ALE is a species of ALD and refers to the growth of a crystalline film on the substrate surface, while ALD is more general and extends to the deposition of amorphous materials as well.
- ALD will be generally used, with the understanding that it includes ALE as well.
- the chemisorbed layer of gas “a” will fully react with gas “b” creating a complete monolayer of solid compound and gaseous byproducts.
- the film is grown by an increasing number of atomic layers. Note that during a chemical exposure, the gas reactivity can be boosted by plasma excitation.
- the substrate is physically moved from an environment or zone where gas “a” is present to another chemically decoupled environment or zone where gas “b” is present.
- the substrate remains in one chamber and is exposed in successive independent steps to gases “a” and “b”.
- the substrate environment is evacuated by pumping and/or is flushed with a nonreactive gas.
- the deposition rate obtained by ALD is low, with a typical rate of 0.1 angstroms/sec. or less.
- a process time of up to 30 minutes can be required to deposit a layer of 15 nm.
- ALD processes tend to have low production rates and tend not to be cost effective.
- a major factor in the long cycle time for time separated ALD is the degassing step in which one reactant is removed from a reaction chamber prior to exposure to the second reactant.
- the degassing must remove the reactant gas from the reaction chamber environment, including the gas delivery subsystem.
- the degassing time is reduced, as degassing is limited to the substrate and the substrate holder or susceptor. For maximum efficiency in a space separated ALD process, quick and effective degassing of the substrate and holder must occur during the transfer of the substrate from zone “a” to zone “b”.
- Careful degassing in space or time separated ALD usually avoids dust formation in the reactive zone proximate to the substrate.
- dust may form downstream toward the pump or in any system dead volume that is not well managed in terms of chemical inter-diffusion. Accumulation of dust, even downstream of the reaction zones, creates a risk for contamination of the substrates in the reactive zone or zones. While careful engineering and maintenance can avoid dust contamination of substrates, the interruptions for regular maintenance required to avoid dust contamination will further reduce the output and cost-effectiveness of the ALD process.
- FIG. 1 shows a prior art turntable apparatus.
- the apparatus 9 contains two reactive enclosures 24 and 34 contained in an outer enclosure 11 .
- Reactive gas inlets 20 and 30 supply reactive gasses to reaction zones 2 and 3 in reactive enclosures 24 and 34 , respectively.
- at least one of the zones 2 and 3 may also comprise plasma excitation by any of the known means.
- a turntable 7 is rotatable on a support arm 60 .
- the substrates 8 rest on the turntable and so are alternately transported through the reactive enclosures 24 and 34 .
- a neutral gas inlet 40 supplies gas to a buffer zone 6 , which surrounds the reactive enclosures 24 and 34 .
- the rotation of the turntable exposes the substrates 8 successively to the reactive gases in the reaction zones 2 and 3 , building up a CVD film.
- the pressure of the reactive gasses in the reaction zones 2 and 3 is kept higher than the pressure of the neutral gas in the buffer zone 6 .
- reactive gas in the reactive zone 2 escapes the reaction enclosure 24 through conductance slits or gaps 21 into the buffer zone 6 .
- reactive gas in the reactive zone 3 escapes the reaction enclosure 34 through conductance slits or gaps 31 into the buffer zone 6 .
- the neutral gas and reactive gases in the buffer zone 1 are vented through the pipe 5 toward a common pump 4 .
- the aim of this design is to create a dynamic gas flow running outward at the periphery of the reactive zones which prevents the contaminated gas from the buffer zone 1 from backstreaming into the reactive zones.
- both excess reactive gases “a” and “b” end up in the buffer zone where they will generate some film and some dust. Because the buffer zone is flushed with neutral gas, the build up of film and dust will take time. However, in the long run, such a system will have a contamination problem, in particular when using highly mutually reactive gases for conformal ALD growth.
- this design is adequate for protecting the chemical purity in the reactive zones, but is inadequate for preventing dust contamination of the system.
- a method of depositing an ALD film on a substrate is provided.
- the substrate is passed through a reactive zone containing reactive gas.
- the reactive zone is in fluid communication with an exhaust zone, which is also in communication with surrounding a buffer zone containing a neutral gas.
- the gas pressure in the buffer zone is higher than the gas pressure in the exhaust zone and is greater than or equal to the gas pressure in the reactive zone.
- the gas pressure in the reactive zone is also higher than the pressure in the exhaust zone.
- the substrate is then passed though a second reactive zone in fluid communication with a second exhaust zone.
- the gas pressure in the buffer zone is higher than the gas pressure in the second exhaust zone and is greater than or equal to the gas pressure in the second reactive zone.
- the gas pressure in the second reactive zone is also higher than the gas pressure in the second exhaust zone.
- FIG. 1 is a cutaway side view of a prior art turntable CVD apparatus.
- FIG. 2 is a cutaway side view of an embodiment of the CVD apparatus of the present invention.
- FIG. 3 is a cutaway side view of an embodiment of the CVD apparatus of the present invention.
- FIG. 4 is a schematic view plan view of a portion of the CVD apparatus of the present invention.
- FIG. 5 is a schematic side view of a portion of the CVD apparatus of the present invention.
- FIG. 6 is a schematic side view of a portion of the CVD apparatus of the present invention.
- the present invention relates to an apparatus for use in CVD or ALD, using a rotary turntable susceptor.
- the same numbers are used generally to refer to the same or similar parts.
- the apparatus 9 has an outer enclosure 11 .
- the outer enclosure contains reactive enclosures 24 and 34 having reactive zones 2 and 3 that are supplied by reactive gas inlet pipes 20 and 30 respectively.
- a neutral gas inlet 40 supplies a neutral flush gas to the buffer zone 6 in the outer enclosure.
- a pipe 55 leads to a pump 4 .
- the substrates 8 rest on the susceptor, a rotary turntable 7 .
- the reactive enclosures 24 and 34 are surrounded by ring-shaped channels 25 and 35 respectively.
- the ring-shaped channels 25 and 35 are connected to separate exhaust pipes 42 and 43 respectively.
- the turntable carries the substrates alternately through the reactive zones 2 and 3 .
- the gas pressure supplied to reactive zone 2 is higher than the gas pressure in exhaust zone 12
- the gas pressure supplied to reactive zone 3 is higher than the gas pressure in exhaust zone 13 .
- the reaction gas in reactive zone 2 escapes through conductance slits or gaps 21 into exhaust zone 12 in ring-shaped channel 25 and exhaust pipe 42 .
- the reaction gas in reactive zone 3 similarly escapes through conductance slits or gaps 31 into exhaust zone 13 in ring-shaped channel 35 and exhaust pipe 43 .
- the reaction gas in either or both of the reactive zones may be in the form of a plasma.
- the neutral gas pressure in the buffer zone 6 is higher than the gas pressure in the exhaust zones 12 and 13 , so that neutral gas from the buffer zone 6 enters exhaust zones 12 and 13 through conductance slits or gaps 22 and 32 respectively.
- the pressure in the buffer zone 6 is greater than or equal to the pressure in the reactive zones 2 and 3 .
- the pressure in the exhaust zone 12 while lower than the pressure in the reactive zone 2 , will be greater than 90%, alternately 95% of the pressure in reaction zone 2 ; and the pressure in the exhaust zone 13 , while lower than the pressure in the reactive zone 3 , will be greater than 90%, alternately 95% of the pressure in the reactive zone 3 .
- the pressure differential between the buffer zone 6 and the exhaust and reaction zones ensures that an inward flow of neutral gas sweeps the periphery of the reactive zones and enters the exhaust zones. This inward flow opposes the diffusion of reactive gases into the buffer zone 6 , thereby preventing the intermixing of non-compatible gases anywhere near the substrate environment.
- the exhaust pipes 25 , 35 and 55 may lead to separate pumps or vents.
- the pipes may join and meet before a common pump. While the use of separate pumps is safer in terms of avoiding gas interaction and in terms of dust management, it may also lead to excessive cost.
- FIG. 3 shows a configuration in which the exhaust pipes join together downstream before a common pump.
- FIG. 3 shows a CVD apparatus according to the invention, in which the exhaust pipes meet downstream of the reactive and buffer zones but upstream of a common pump. If a design like that shown in FIG. 3 is used for the apparatus, then the exhaust pipes 42 and 43 should each run separately for a distance of at least about 0.5 m, and preferably for at least 1.0 m before joining together.
- Optional pressure regulation systems 52 and 53 are shown in the exhaust pipes 42 and 43 . These can be used to provide different pressures between the exhaust zones 12 and 13 , and thereby indirectly affect the pressures in the reaction zones 2 and 3 . If the gas pressure in the reaction zones 2 and 3 can be equal to each other, then the pressure regulation systems would be largely unnecessary.
- the exhaust pipe 55 is grayed out to show that it is an optional part. It is possible to channel all neutral gas and reaction gases out through the exhaust pipes 42 and 43 . If the exhaust pipe 55 is present in this design, however, then to maintain a higher pressure in buffer zone than in the exhaust zones 12 and 13 a throttling means in the exhaust pipe 55 should be provided.
- the dotted line 99 in FIG. 3 generally indicates the area where the reactive gases “a” and “b” from the reactive zones will meet and where dust will form. For this reason, it is desirable that the conduits in this area should be easily disassembled for periodic maintenance and cleaning.
- the rotary susceptor will be heated to approximately the same temperature as the substrate, and so also will be coated with a deposition film. While this film may be removed by treatment with a gas such as ClF 3 or F 2 or a plasma such as NF 3 , physical cleaning may be desirable to remove more difficult films such as Ta 2 O 5 , Al 2 O 3 , ZrO 2 , etc.
- the apparatus may be designed with a large seal surrounding the periphery of the apparatus, allowing the system to be opened for access to the susceptor. Another option is to have a wide valve or side opening at the level of the susceptor, allowing the susceptor to slide out on a fork.
- the reactor temperature is often lower than the substrate temperature.
- the main reason is that the reactor walls would develop a coating as fast as the substrate does if they were maintained at the same temperature.
- the temperature of the reactor in time separated ALD is therefore usually maintained approximately 40°-60° C. lower than the susceptor temperature. This can lead to imprecision in the substrate temperature, as it tends to adopt an intermediate temperature between the susceptor temperature and the temperature of the reactor walls.
- factors such as wall emissivity, gas pressure and composition may affect the substrate temperature.
- Maintaining an elevated reactor wall temperature also causes the system to degas faster, allowing faster elimination of contaminants at the beginning of an ALD cycle and reduced contamination.
- the reactor walls are preferably maintained at a temperature 10°-20° C. lower than the substrate temperature. Thermophoresis pushes dust particles toward the coldest side of a gas gap, so this minor temperature differential will help ensure that any gas-borne dust will preferably go to upper part of the reactor rather than drifting onto the substrate.
- the upper wall of the reaction chamber should also be maintained at a temperature approximately 10°-30° C. below the susceptor temperature.
- the manner of injecting the reactive gases “a” and “b” is also important.
- a substrate or wafer is exposed to a reactive chemical exposure zone during rotation. In one turn the substrate experiences at least two exposures, one with “a” and one with “b”. It is possible to increase the deposition rate without increasing the rotation rate by having a larger number of exposure zones per rotation.
- each exposure zone 101 , 102 should have the shape of a “pie segment”.
- the objective of this segmentation is to ensure that all parts of the wafer spend the same time in the reactive zone.
- the time spent by any point of the wafer is the angular velocity of the susceptor divided by the angle of the pie segment of the corresponding zone. It is not necessary, however, that all segments have the same angle. If more time is needed for exposure to gas “a” than for exposure to gas “b”, it may make sense to enlarge the angle of the zone for exposure of the substrate to “a”.
- the time required to saturate the surface chemistry during a chemical exposure can also be adjusted by the concentration of reactant in the reaction zone.
- the reactive gases can therefore be diluted with a neutral gas differently in the various reaction zones if their exposure times will be of the same order.
- skimming zone can be a “pie segment” or sector which the substrate passes through during the CVD process. In ALD the skimming process is as important as the exposure process.
- the “skimming” process can be considered as a “negative exposure” to “a” or “b”.
- skimming time should also be a process constant for all points along the radius of the “pie segment”. During the skimming the substrate is subjected to a flow of neutral gas that flushes away the excess and physisorbed “a” molecules.
- the degassing time required is a function of temperature and chemistry of the wall and gas constituents.
- the reactive gas should be delivered to a reactive zone pie segment and pumped out of the reactive zone into the ring-shaped channel. Because gas diffusion in the direction parallel to the turntable radius (toward the outer edge of the pie segment) is limited, it is necessary to provide a greater degree of gas delivery toward the outer edge of the segment. Thus the gas delivery should be delivered with a local inflow increasing proportionally to the radial distance from the turntable axis.
- Each of the pie segment process zones will be referred to hereinafter as either reactive zones (which contain gasses “a” or “b”) or skimming zones (which contain neutral gas).
- One way to achieve radially increasing gas delivery is to flow in the gas using a uniform showerhead covering the entire pie segment.
- the width of the segment increases proportionally to the radius, leading to proportional increase of showerhead area and thus gas delivery.
- This method can create gas eddies or vortices, which can affect the integrity of the CVD process.
- the moving turntable provides a boundary condition for the gas flow dynamic which creates this risk of eddy. Eddies may create long residence time pockets for gas. If the turn table at any point moves far faster than the local average gas velocity, then there is a risk for vortex and a stagnation point to form in the gas flow pattern. The risk associated with a stagnation point is the build up of dust in the gas phase.
- the risk can be reduced by taking a number of measures, including 1) using very pure process gases, 2) carefully avoiding mutual contamination of gas “a” by gas “b” and vice versa, 3) having an upward thermophoresis in the system, and 4) making regular maintenance in the system. If these conditions are all optimized, then some degree of eddy in the gas flow pattern can be tolerated.
- an advantageous design for delivering gas without eddy is to deliver the gas along a radial line at or near the edge of the pie segment where the substrate enters, with increasing gas flow toward the periphery of the pie segment. This is shown in pie segment 102 of FIG. 4 and process zone 114 of FIG. 5 .
- the increasing gas flow toward the periphery of the pie segment is indicated by increasing length of arrows representing the gas flow.
- the reactive gas then flows parallel to the motion of the substrate within the pie segment. Because the gap or conductance slit leading to the ring-shaped channel is narrow in width, the majority of the gas flows along with the motion of the turntable, rather than out of the reactive zone.
- the average gas velocity should be at least about 35% of the substrate local velocity.
- the substrate is placed in an insert in the turntable in such a way that the horizontal surfaces are well aligned, preferably to an accuracy of +/ ⁇ 0.2 mm, ideally +/ ⁇ 0.1 mm.
- the time spent by the substrate in the skimming zone is significantly larger than the time necessary for the physisorbed species present on the substrate to degas.
- This time is defined essentially by chemistry and by the process temperature. For a given ALD process the temperature will have to be raised until the necessary time is reached. For a turntable rotation of 60 rpm, the substrate typically stays in a skimming zone for about 10 ms. Hence, the natural degassing time should be less than a few milliseconds. It is also required that the skimming neutral gas evacuates the reactive molecules before they have a chance to adsorb to the surface again.
- a counterstream design is better than a situation where both the neutral “rinsing” gas and the substrate move in the same direction. This is the case, despite the fact that counterstream flow of the gas may lead to some vortex formation, since the limit gas layer very near the substrate is moving with the substrate while the main gas stream flows in the opposite direction.
- the gas is injected into the skimming zone at or near the edge of the pie segment furthest from the edge where the substrate enters the skimming zone.
- the skimming zone is made up of a number of subsections, each having a pair of gas injection and evacuation channels, each having a gas flow parallel to the substrate motion.
- This design avoids stagnation points by reducing vortex formation, but comes at the expense of a more complex design.
- all degassed molecules emitted by the substrate move with the gas, and use of only one skimming zone segment would result in inadequate degassing.
- measurement means in the apparatus to monitor a substrate property, such as alignment or thickness of the deposited film.
- the measurement means may communicate with a control means in a known way to adjust a process parameter in response to output of the measurement means.
Abstract
A chemical vapor deposition method and apparatus is disclosed. The process is carried out in an apparatus having a number reactive zones, each surrounded by a corresponding exhaust zone, all of which are both contained within a buffer zone. Pressure relationships are controlled such that buffer gas from the buffer zone flows into the exhaust zones and reactive gas from the reactive zones flow into the exhaust zones. As a result, cross-contamination of gases between the reactive zones is avoided.
Description
- This application claims the benefit of U.S.
Provisional Patent Application 60/394,086, which is incorporated by reference herein in its entirety. - The invention relates to a method and apparatus for atomic layer deposition (ALD) or epitaxy, in particular a method for performing ALD using a rotary susceptor apparatus.
- Atomic Layer Deposition (ALD) (also referred to as Atomic Layer Epitaxy, or ALE) is a Chemical Vapor Deposition (CVD) technique. Classical CVD is based on exposing a surface to a gas mixture. The surface is heated, and the heat induces a reaction and/or decomposition of the gases. This results in the formation of a solid film layer on the surface.
- ALE is a species of ALD and refers to the growth of a crystalline film on the substrate surface, while ALD is more general and extends to the deposition of amorphous materials as well. In this specification the term ALD will be generally used, with the understanding that it includes ALE as well.
- The principle of ALD is that the raw materials are two gases, which will be referred to as “a” and “b”. The gases “a” and “b” are so mutually reactive that they cannot be present at the same time in a gas mixture, as they would spontaneously react, leading to self-ignition or formation of dust. To form the film, the substrate is alternately exposed to the two gases. Care is required to ensure that the first gas is adequately eliminated from the substrate environment before the second gas is introduced to the substrate environment. A fraction of the first gas is chemisorbed as a mono-layer on the substrate surface, and it is this chemisorbed fraction of the first gas that reacts with the second gas to form the growing layer on the surface. Given sufficient exposure time, the chemisorbed layer of gas “a” will fully react with gas “b” creating a complete monolayer of solid compound and gaseous byproducts. By removing the second gas from the substrate environment, exposing the substrate to the first gas, and repeating the process, the film is grown by an increasing number of atomic layers. Note that during a chemical exposure, the gas reactivity can be boosted by plasma excitation.
- In the past, two basic techniques have been used to separate the reactive gases in ALD. These are referred to as the space separation method and the time separation method.
- In the space separation method, the substrate is physically moved from an environment or zone where gas “a” is present to another chemically decoupled environment or zone where gas “b” is present.
- In the time separation method, the substrate remains in one chamber and is exposed in successive independent steps to gases “a” and “b”. In between additions of the reactive gases, the substrate environment is evacuated by pumping and/or is flushed with a nonreactive gas.
- The deposition rate obtained by ALD is low, with a typical rate of 0.1 angstroms/sec. or less. A process time of up to 30 minutes can be required to deposit a layer of 15 nm. As a result, ALD processes tend to have low production rates and tend not to be cost effective.
- A major factor in the long cycle time for time separated ALD is the degassing step in which one reactant is removed from a reaction chamber prior to exposure to the second reactant. In this method, the degassing must remove the reactant gas from the reaction chamber environment, including the gas delivery subsystem. In contrast, when space separation is used, the degassing time is reduced, as degassing is limited to the substrate and the substrate holder or susceptor. For maximum efficiency in a space separated ALD process, quick and effective degassing of the substrate and holder must occur during the transfer of the substrate from zone “a” to zone “b”.
- Failure to effectively degas the reaction environment or remove the reactant gas “a” from the substrate prior to exposure to reactant gas “b” will result in unwanted gas phase reactions leading to non conformal deposition or to dust formation, as the mingling gases will produce freely floating particles of the material that is supposed to be deposited on the substrate.
- Careful degassing in space or time separated ALD usually avoids dust formation in the reactive zone proximate to the substrate. However, in systems utilizing a single pump downstream of the reactive zone or zones, dust may form downstream toward the pump or in any system dead volume that is not well managed in terms of chemical inter-diffusion. Accumulation of dust, even downstream of the reaction zones, creates a risk for contamination of the substrates in the reactive zone or zones. While careful engineering and maintenance can avoid dust contamination of substrates, the interruptions for regular maintenance required to avoid dust contamination will further reduce the output and cost-effectiveness of the ALD process.
- In addition, periodic maintenance is required to remove deposition film from the interior of reaction chambers used in time separation ALD methods. Because the walls of the chamber are also exposed to alternating reactive gasses, a layer of ALD film tends to form on the reactor chamber's walls. The rate of deposition can be reduced by lowering the temperature of the reactor chamber's walls, but this tends to also slow the rate of degassing, hence the ALD cycle rate, further reducing deposition rate efficiency. The need for this type of periodic maintenance is reduced in reactors based on space separation ALD. Because the chamber walls are not subjected to alternating exposure to reaction gasses “a” and “b”, the chambers do not build up a layer of the deposition film. The substrate carrier will still be exposed to the alternating reactive gas environments, but cleaning of the substrate carrier entails much less downtime for the ALD apparatus than cleaning of reactor chambers.
- One approach to space separation has been the use of a susceptor in the form of a turntable which carries a substrate through a number of different and non-compatible chemical environments. This approach has been used when the gases in the non-compatible chemical environments are moderately reactive. ALD processes for use in semiconductor integrated circuit manufacturing, however, will require the use of gases which are strongly mutually reactive in order to create deposited layers meeting required standards of thickness control and conformality. Currently available turntable designs are unsatisfactory for use with such highly reactive gases.
-
FIG. 1 shows a prior art turntable apparatus. Theapparatus 9 contains tworeactive enclosures outer enclosure 11.Reactive gas inlets reaction zones reactive enclosures zones turntable 7 is rotatable on asupport arm 60. Thesubstrates 8 rest on the turntable and so are alternately transported through thereactive enclosures buffer zone 6, which surrounds thereactive enclosures substrates 8 successively to the reactive gases in thereaction zones reaction zones buffer zone 6. During the process, reactive gas in thereactive zone 2 escapes thereaction enclosure 24 through conductance slits orgaps 21 into thebuffer zone 6. At the same time, reactive gas in thereactive zone 3 escapes thereaction enclosure 34 through conductance slits orgaps 31 into thebuffer zone 6. The neutral gas and reactive gases in the buffer zone 1 are vented through thepipe 5 toward acommon pump 4. The aim of this design is to create a dynamic gas flow running outward at the periphery of the reactive zones which prevents the contaminated gas from the buffer zone 1 from backstreaming into the reactive zones. In this design, however, both excess reactive gases “a” and “b” end up in the buffer zone where they will generate some film and some dust. Because the buffer zone is flushed with neutral gas, the build up of film and dust will take time. However, in the long run, such a system will have a contamination problem, in particular when using highly mutually reactive gases for conformal ALD growth. Thus, this design is adequate for protecting the chemical purity in the reactive zones, but is inadequate for preventing dust contamination of the system. - It would be desirable to have an ALD apparatus for use in space separation ALD that would allow the use of highly mutually reactive gasses and that would minimize the formation of dust downstream of the reaction chambers.
- A method of depositing an ALD film on a substrate is provided. The substrate is passed through a reactive zone containing reactive gas. The reactive zone is in fluid communication with an exhaust zone, which is also in communication with surrounding a buffer zone containing a neutral gas. The gas pressure in the buffer zone is higher than the gas pressure in the exhaust zone and is greater than or equal to the gas pressure in the reactive zone. The gas pressure in the reactive zone is also higher than the pressure in the exhaust zone. The substrate is then passed though a second reactive zone in fluid communication with a second exhaust zone. The gas pressure in the buffer zone is higher than the gas pressure in the second exhaust zone and is greater than or equal to the gas pressure in the second reactive zone. The gas pressure in the second reactive zone is also higher than the gas pressure in the second exhaust zone. This series of structural and pressure relationships minimizes cross-contamination of gases between the reactive zones.
-
FIG. 1 is a cutaway side view of a prior art turntable CVD apparatus. -
FIG. 2 is a cutaway side view of an embodiment of the CVD apparatus of the present invention. -
FIG. 3 is a cutaway side view of an embodiment of the CVD apparatus of the present invention. -
FIG. 4 is a schematic view plan view of a portion of the CVD apparatus of the present invention. -
FIG. 5 is a schematic side view of a portion of the CVD apparatus of the present invention. -
FIG. 6 is a schematic side view of a portion of the CVD apparatus of the present invention. - The present invention relates to an apparatus for use in CVD or ALD, using a rotary turntable susceptor. In the following description, the same numbers are used generally to refer to the same or similar parts.
- The present invention is designed to avoid intermixing of non-compatible gases in any place close to the substrate environment. Referring to
FIG. 2 , theapparatus 9 has anouter enclosure 11. The outer enclosure containsreactive enclosures reactive zones gas inlet pipes neutral gas inlet 40 supplies a neutral flush gas to thebuffer zone 6 in the outer enclosure. Apipe 55 leads to apump 4. Thesubstrates 8 rest on the susceptor, arotary turntable 7. Thereactive enclosures channels channels exhaust pipes - In operation, the turntable carries the substrates alternately through the
reactive zones reactive zone 2 is higher than the gas pressure inexhaust zone 12, and the gas pressure supplied toreactive zone 3 is higher than the gas pressure inexhaust zone 13. Thus the reaction gas inreactive zone 2 escapes through conductance slits orgaps 21 intoexhaust zone 12 in ring-shapedchannel 25 andexhaust pipe 42. The reaction gas inreactive zone 3 similarly escapes through conductance slits orgaps 31 intoexhaust zone 13 in ring-shapedchannel 35 andexhaust pipe 43. The reaction gas in either or both of the reactive zones may be in the form of a plasma. - At the same time, the neutral gas pressure in the
buffer zone 6 is higher than the gas pressure in theexhaust zones buffer zone 6 entersexhaust zones gaps buffer zone 6 is greater than or equal to the pressure in thereactive zones exhaust zone 12, while lower than the pressure in thereactive zone 2, will be greater than 90%, alternately 95% of the pressure inreaction zone 2; and the pressure in theexhaust zone 13, while lower than the pressure in thereactive zone 3, will be greater than 90%, alternately 95% of the pressure in thereactive zone 3. - The pressure differential between the
buffer zone 6 and the exhaust and reaction zones ensures that an inward flow of neutral gas sweeps the periphery of the reactive zones and enters the exhaust zones. This inward flow opposes the diffusion of reactive gases into thebuffer zone 6, thereby preventing the intermixing of non-compatible gases anywhere near the substrate environment. In the design, it is not important that the pressure differentials be great, as long as the foregoing pressure relationships are maintained. If the pressure difference between the reaction zones and the exhaust zones is small, then the relative system pressures can be effectively controlled by controlling the downstream pressure in the separate exhaust pipes. - The
exhaust pipes FIG. 3 shows a configuration in which the exhaust pipes join together downstream before a common pump. -
FIG. 3 shows a CVD apparatus according to the invention, in which the exhaust pipes meet downstream of the reactive and buffer zones but upstream of a common pump. If a design like that shown inFIG. 3 is used for the apparatus, then theexhaust pipes pressure regulation systems exhaust pipes exhaust zones reaction zones reaction zones - In
FIG. 3 , theexhaust pipe 55 is grayed out to show that it is an optional part. It is possible to channel all neutral gas and reaction gases out through theexhaust pipes exhaust pipe 55 is present in this design, however, then to maintain a higher pressure in buffer zone than in theexhaust zones 12 and 13 a throttling means in theexhaust pipe 55 should be provided. - The dotted
line 99 inFIG. 3 generally indicates the area where the reactive gases “a” and “b” from the reactive zones will meet and where dust will form. For this reason, it is desirable that the conduits in this area should be easily disassembled for periodic maintenance and cleaning. - During CVD or ALD the rotary susceptor will be heated to approximately the same temperature as the substrate, and so also will be coated with a deposition film. While this film may be removed by treatment with a gas such as ClF3 or F2 or a plasma such as NF3, physical cleaning may be desirable to remove more difficult films such as Ta2O5, Al2O3, ZrO2, etc. The apparatus may be designed with a large seal surrounding the periphery of the apparatus, allowing the system to be opened for access to the susceptor. Another option is to have a wide valve or side opening at the level of the susceptor, allowing the susceptor to slide out on a fork.
- In time separated ALD the reactor temperature is often lower than the substrate temperature. The main reason is that the reactor walls would develop a coating as fast as the substrate does if they were maintained at the same temperature. The temperature of the reactor in time separated ALD is therefore usually maintained approximately 40°-60° C. lower than the susceptor temperature. This can lead to imprecision in the substrate temperature, as it tends to adopt an intermediate temperature between the susceptor temperature and the temperature of the reactor walls. In addition, factors such as wall emissivity, gas pressure and composition may affect the substrate temperature.
- In a space separated ALD system, it is not necessary to lower the reactor wall temperature, at least as long as reactive gas cross contamination is avoided. For this reason, it is common to maintain the reactor wall temperature at or only slightly below the susceptor temperature. This maintains a more constant and controllable temperature of the substrate.
- Maintaining an elevated reactor wall temperature also causes the system to degas faster, allowing faster elimination of contaminants at the beginning of an ALD cycle and reduced contamination.
- For reasons of dust and particle management, however, the reactor walls are preferably maintained at a
temperature 10°-20° C. lower than the substrate temperature. Thermophoresis pushes dust particles toward the coldest side of a gas gap, so this minor temperature differential will help ensure that any gas-borne dust will preferably go to upper part of the reactor rather than drifting onto the substrate. The upper wall of the reaction chamber should also be maintained at a temperature approximately 10°-30° C. below the susceptor temperature. - The manner of injecting the reactive gases “a” and “b” is also important. A substrate or wafer is exposed to a reactive chemical exposure zone during rotation. In one turn the substrate experiences at least two exposures, one with “a” and one with “b”. It is possible to increase the deposition rate without increasing the rotation rate by having a larger number of exposure zones per rotation.
- As shown schematically in
FIG. 4 , whenmultiple exposure zones exposure zone - For ALD, however, the time required to saturate the surface chemistry during a chemical exposure can also be adjusted by the concentration of reactant in the reaction zone. The reactive gases can therefore be diluted with a neutral gas differently in the various reaction zones if their exposure times will be of the same order.
- Once the substrate has been exposed to “a”, its surface becomes covered with molecules of “a” which are either chemisorbed or physisorbed. A degassing phase is desirable to remove most of the physisorbed molecules. This is the purpose of a “skimming zone”. A skimming zone can be a “pie segment” or sector which the substrate passes through during the CVD process. In ALD the skimming process is as important as the exposure process. The “skimming” process can be considered as a “negative exposure” to “a” or “b”. Like exposure in the reactive zones, skimming time should also be a process constant for all points along the radius of the “pie segment”. During the skimming the substrate is subjected to a flow of neutral gas that flushes away the excess and physisorbed “a” molecules. The degassing time required is a function of temperature and chemistry of the wall and gas constituents.
- The reactive gas should be delivered to a reactive zone pie segment and pumped out of the reactive zone into the ring-shaped channel. Because gas diffusion in the direction parallel to the turntable radius (toward the outer edge of the pie segment) is limited, it is necessary to provide a greater degree of gas delivery toward the outer edge of the segment. Thus the gas delivery should be delivered with a local inflow increasing proportionally to the radial distance from the turntable axis. Each of the pie segment process zones will be referred to hereinafter as either reactive zones (which contain gasses “a” or “b”) or skimming zones (which contain neutral gas).
- One way to achieve radially increasing gas delivery is to flow in the gas using a uniform showerhead covering the entire pie segment. The width of the segment increases proportionally to the radius, leading to proportional increase of showerhead area and thus gas delivery. This method, however, can create gas eddies or vortices, which can affect the integrity of the CVD process. The moving turntable provides a boundary condition for the gas flow dynamic which creates this risk of eddy. Eddies may create long residence time pockets for gas. If the turn table at any point moves far faster than the local average gas velocity, then there is a risk for vortex and a stagnation point to form in the gas flow pattern. The risk associated with a stagnation point is the build up of dust in the gas phase. The risk can be reduced by taking a number of measures, including 1) using very pure process gases, 2) carefully avoiding mutual contamination of gas “a” by gas “b” and vice versa, 3) having an upward thermophoresis in the system, and 4) making regular maintenance in the system. If these conditions are all optimized, then some degree of eddy in the gas flow pattern can be tolerated.
- As shown schematically in
FIG. 4 andFIG. 5 , an advantageous design for delivering gas without eddy is to deliver the gas along a radial line at or near the edge of the pie segment where the substrate enters, with increasing gas flow toward the periphery of the pie segment. This is shown inpie segment 102 ofFIG. 4 andprocess zone 114 ofFIG. 5 . InFIG. 4 the increasing gas flow toward the periphery of the pie segment is indicated by increasing length of arrows representing the gas flow. The reactive gas then flows parallel to the motion of the substrate within the pie segment. Because the gap or conductance slit leading to the ring-shaped channel is narrow in width, the majority of the gas flows along with the motion of the turntable, rather than out of the reactive zone. - To minimize eddy using such a gas delivery method, it is desirable that the average gas velocity should be at least about 35% of the substrate local velocity. To ensure smooth flow of the gas, it is desirable that the substrate is placed in an insert in the turntable in such a way that the horizontal surfaces are well aligned, preferably to an accuracy of +/−0.2 mm, ideally +/−0.1 mm.
- When degassing, it is necessary that the time spent by the substrate in the skimming zone is significantly larger than the time necessary for the physisorbed species present on the substrate to degas. This time is defined essentially by chemistry and by the process temperature. For a given ALD process the temperature will have to be raised until the necessary time is reached. For a turntable rotation of 60 rpm, the substrate typically stays in a skimming zone for about 10 ms. Hence, the natural degassing time should be less than a few milliseconds. It is also required that the skimming neutral gas evacuates the reactive molecules before they have a chance to adsorb to the surface again. For this purpose a counterstream design is better than a situation where both the neutral “rinsing” gas and the substrate move in the same direction. This is the case, despite the fact that counterstream flow of the gas may lead to some vortex formation, since the limit gas layer very near the substrate is moving with the substrate while the main gas stream flows in the opposite direction. As shown schematically in
FIG. 4 insegment 101 and inFIG. 5 in skimmingzone 112, in a counterstream design the gas is injected into the skimming zone at or near the edge of the pie segment furthest from the edge where the substrate enters the skimming zone. - If vortex formation leads to significant particle contamination, an alternative skimming zone design may be used. As shown schematically in
FIG. 6 , the skimming zone is made up of a number of subsections, each having a pair of gas injection and evacuation channels, each having a gas flow parallel to the substrate motion. This design avoids stagnation points by reducing vortex formation, but comes at the expense of a more complex design. In this design, all degassed molecules emitted by the substrate move with the gas, and use of only one skimming zone segment would result in inadequate degassing. For this reason, it is preferred to extract the degas component in a skimming zone having either a single counterstream segment, or having a plurality of segments utilizing gas flow in the same direction as the rotation of the turntable. - It may be advantageous to include measurement means in the apparatus to monitor a substrate property, such as alignment or thickness of the deposited film. The measurement means may communicate with a control means in a known way to adjust a process parameter in response to output of the measurement means.
- Although the preferred embodiments of the invention have been shown and described, it should be understood that various modifications and changes may be resorted to without departing from the scope of the invention as disclosed and claimed herein.
Claims (13)
1. A CVD-ALD apparatus comprising:
an outer enclosure;
a first exhaust pipe having a first end located inside the outer enclosure;
a second exhaust pipe having a first end located inside the outer enclosure;
a first reaction enclosure located inside the outer enclosure and in fluid communication with the first exhaust pipe, the first reaction enclosure defining an opening;
a second reaction enclosure located inside the outer enclosure and in fluid communication with the second exhaust pipe, the second reaction enclosure defining an opening;
a susceptor disposed adjacent to the first end of the first exhaust pipe, the first end of the second exhaust pipe, the opening of the first reaction enclosure, and the opening of the second reaction enclosure;
a neutral gas supply;
a means for supplying a first reaction gas to the first reaction enclosure; and
a means for supplying a second reaction gas to the second reaction enclosure.
2. The apparatus according to claim 1 , further comprising:
a first reaction gas at a first, reactive zone pressure in the first reaction enclosure;
a neutral gas at a second, buffer zone pressure in a buffer zone in the outer enclosure;
a first exhaust gas at a third, exhaust zone pressure in the first exhaust pipe;
a second reaction gas at a fourth, reaction zone pressure in the second reaction enclosure; and
a second exhaust gas at a fifth, exhaust zone pressure in the second exhaust pipe; wherein the second, buffer zone pressure is greater than the third, exhaust zone pressure, the second, buffer zone pressure is greater than the fifth, exhaust zone pressure, the first, reaction zone pressure is greater than the third, exhaust zone pressure, and the fourth, reactive zone pressure is greater than the fifth, exhaust zone pressure.
3. The apparatus according to claim 2 , wherein the second, buffer zone pressure is greater than or equal to the first, reactive zone pressure, and the second, buffer zone pressure is greater than the fourth, reactive zone pressure.
4. The apparatus according to claim 1 , wherein the first end of the first exhaust pipe and the susceptor define a first conductance slit.
5. The apparatus according to claim 4 , wherein the first end of the second exhaust pipe and the susceptor define a second conductance slit.
6. The apparatus according to claim 4 , wherein each of the conductance slit has essentially a constant width along the exhaust zone outer periphery.
7. The apparatus according to claim 5 , wherein each of the conductance slits has essentially a constant width along the exhaust zone outer periphery.
8. The apparatus according to claim 6 , wherein the width of the conductance slit is 0.3-1.5 mm.
9. The apparatus according to claim 7 , wherein the width of each conductance slit is 0.3-1.5 mm.
10. The apparatus according to claim 1 , wherein the first exhaust pipe and the second exhaust pipe join together outside of the outer enclosure, and the extent of one of the exhaust pipes between its first end and the location where the pipes are joined is at least 0.5 m.
11. The apparatus according to claim 1 , wherein the susceptor is rotatably mounted on a spindle.
12. The apparatus according to claim 11 , wherein the first gas distribution means and the second gas distribution means each comprise means for distributing gas along the susceptor's rotation axis.
13. The apparatus according to claim 1 , wherein a surface of the susceptor defines a plurality of recesses for receiving substrates, the recesses being sized so that the exposed surface of each substrate and the surface of the susceptor are within 0.2 mm of being at the same level.
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US10/612,513 US6869641B2 (en) | 2002-07-03 | 2003-07-02 | Method and apparatus for ALD on a rotary susceptor |
US11/085,487 US20050160984A1 (en) | 2002-07-03 | 2005-03-21 | Method and apparatus for ALD on a rotary susceptor |
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